Is there a rule in ancient kitchens that onions are cut into nine sections and ginger is cut into three sections? How it came into being.

Ginger is cut into three sections, representing Jiangshan, and onion is cut into nine sections. Nine sections are incomparable, representing Jiangshan for a long time. In ancient times, there was a saying that the nine palaces were destined to live forever, which meant returning to the original, meaning that the son of heaven was destined to live forever. If it was not doomed by heaven, it was the ten palaces. So everything is nine, including the dragon robe for Kowloon, the carving of the beams, and the items of the palace master (including the toilet) are all from Kowloon.